21813705

素因数分解:

$3^4\times 5^1\times {\mathrm{53861}}^1$

素因数の和:53878

約数の個数: 20

約数和(自身を含む): 39103812

約数和(自身を除く): 17290107

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 53861, 161583, 269305, 484749, 807915, 1454247, 2423745, 4362741, 7271235, 21813705]

約数ペア:

[(1, 21813705), (3, 7271235), (5, 4362741), (9, 2423745), (15, 1454247), (27, 807915), (45, 484749), (81, 269305), (135, 161583), (405, 53861)]